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Assessing lower-body peak power in elite rugby-union players.
J Strength Cond Res. 2011 Jun; 25(6):1616-21.JS

Abstract

Resistance training at the load that maximizes peak power (Pmax) may produce greater increases in peak power than other loads. Pmax for lower-body lifts can occur with no loading but whether Pmax can be increased further with negative loading is unclear. The purpose of this investigation was therefore to determine lower-body Pmax (jump squat) using a spectrum of loads. Box squat 1 repetition maximum (1RM) was measured in 18 elite rugby-union players. Pmax was then determined using loads of -28 to 60%1RM. Elastic bands were used to unload body weight for negative loads. Jump squat Pmax occurred with no loading (body weight: 8,880 ± 2,186 W) in all but 2 subjects. There was a discontinuity in the power-load relationship for the jump squat, possibly because of the increased countermovement in the body weight jump. The self-selected depth (dip) before the propulsive phase of the jump was greater by 24 ± 11 to 40 ± 16% (moderate to large effect size) than all positive loads. These findings highlight methodological issues that need to be taken into consideration when comparing power outputs of loaded and unloaded jumps.

Authors+Show Affiliations

Division of Sport and Recreation, Institute of Sport and Recreation Research New Zealand, AUT University, Auckland, New Zealand. argy15@hotmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21386727

Citation

Argus, Christos K., et al. "Assessing Lower-body Peak Power in Elite Rugby-union Players." Journal of Strength and Conditioning Research, vol. 25, no. 6, 2011, pp. 1616-21.
Argus CK, Gill ND, Keogh JW, et al. Assessing lower-body peak power in elite rugby-union players. J Strength Cond Res. 2011;25(6):1616-21.
Argus, C. K., Gill, N. D., Keogh, J. W., & Hopkins, W. G. (2011). Assessing lower-body peak power in elite rugby-union players. Journal of Strength and Conditioning Research, 25(6), 1616-21. https://doi.org/10.1519/JSC.0b013e3181ddfabc
Argus CK, et al. Assessing Lower-body Peak Power in Elite Rugby-union Players. J Strength Cond Res. 2011;25(6):1616-21. PubMed PMID: 21386727.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Assessing lower-body peak power in elite rugby-union players. AU - Argus,Christos K, AU - Gill,Nicholas D, AU - Keogh,Justin W L, AU - Hopkins,Will G, PY - 2011/3/10/entrez PY - 2011/3/10/pubmed PY - 2011/9/22/medline SP - 1616 EP - 21 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 25 IS - 6 N2 - Resistance training at the load that maximizes peak power (Pmax) may produce greater increases in peak power than other loads. Pmax for lower-body lifts can occur with no loading but whether Pmax can be increased further with negative loading is unclear. The purpose of this investigation was therefore to determine lower-body Pmax (jump squat) using a spectrum of loads. Box squat 1 repetition maximum (1RM) was measured in 18 elite rugby-union players. Pmax was then determined using loads of -28 to 60%1RM. Elastic bands were used to unload body weight for negative loads. Jump squat Pmax occurred with no loading (body weight: 8,880 ± 2,186 W) in all but 2 subjects. There was a discontinuity in the power-load relationship for the jump squat, possibly because of the increased countermovement in the body weight jump. The self-selected depth (dip) before the propulsive phase of the jump was greater by 24 ± 11 to 40 ± 16% (moderate to large effect size) than all positive loads. These findings highlight methodological issues that need to be taken into consideration when comparing power outputs of loaded and unloaded jumps. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/21386727/Assessing_lower_body_peak_power_in_elite_rugby_union_players_ DB - PRIME DP - Unbound Medicine ER -